CVE-2025-9708— Kubernetes C# Client: improper certificate validation in custom CA mode may lead to man-in-the-middle attacks
Quick assessment
Affected
Kubernetes Kubernetes CSharp Client
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Kubernetes（K8s）是Kubernetes开源的一个开源系统，用于自动部署、扩展和管理容器化应用程序。 Kubernetes存在安全漏洞，该漏洞源于证书验证逻辑未正确验证信任链，可能导致中间人攻击和API冒充。
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2025-9708
Vulnerability Information
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Vulnerability Title
Kubernetes C# Client: improper certificate validation in custom CA mode may lead to man-in-the-middle attacks
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability exists in the Kubernetes C# client where the certificate validation logic accepts properly constructed certificates from any Certificate Authority (CA) without properly verifying the trust chain. This flaw allows a malicious actor to present a forged certificate and potentially intercept or manipulate communication with the Kubernetes API server, leading to possible man-in-the-middle attacks and API impersonation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Kubernetes 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubernetes（K8s）是Kubernetes开源的一个开源系统，用于自动部署、扩展和管理容器化应用程序。 Kubernetes存在安全漏洞，该漏洞源于证书验证逻辑未正确验证信任链，可能导致中间人攻击和API冒充。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Kubernetes | Kubernetes CSharp Client | 0 ~ 17.0.13 | - |
|
II. Public POCs for CVE-2025-9708
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2025-9708 (1)
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